Update to Node 20.

Author: Mailaender

.github/workflows/deploy.yml

@@ -11,10 +11,10 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Clone Repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Clone Deploy Repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           repository: openra/openra.github.io
           token: ${{ secrets.DEPLOY_TOKEN }}